Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a523b1ff5de73f…

MALICIOUS

PDF

35.9 KB First seen: 2026-05-08
MD5: 6117f9b4a7b96cf47a98261afa82bbf1 SHA-1: 019041a25d30d949d9945bd6b670b3f91f19db49 SHA-256: 05a523b1ff5de73f78772abb1bd51d6aad821942a10ded815f0e3a31b403dd50
70 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of an exploit, including a malformed active-content stream and embedded script payloads. The ML classifier strongly indicates maliciousness. While no specific URLs for payloads were extracted, the presence of embedded files and malformed streams suggests the document is designed to execute arbitrary code, likely as a downloader for further stages. The benign URLs present are likely decoys or standard PDF/XFA references.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 46 bytes
SHA-256: 0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x138 674 bytes
SHA-256: b15f1c11171b157d3ace5ee24f8ea3ed9b70efd0bffd159172c277db7381b192
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x41F 153 bytes
SHA-256: c66333dd9fd55faa949136c86f83475fdfc8ac35db92beda039a862bc418a3e4
embedded_file_obj0011.bin pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4FD 437 bytes
SHA-256: 919311c4f3a5f8d631c55fffd296ccf550fdb5d7b4350edc85e72b711cfc5686
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F7 181 bytes
SHA-256: 072090be5ea6c4a216543a1d4332d27d322264f3038bbd986db2a09048143a1c
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7F2 34095 bytes
SHA-256: cfd6844f37690c6a089b6befb0b5cdb241024e2f384968f187f9f7cacad0ac2a

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